Creator of Tom Sawyer (5)

I believe the answer is:

twain

(Other definitions for twain that I've seen before include "Archaic word for two" , "Pair (archaic) - US novelist, Mark" , "I want (anag) - US novelist and humorist" , "American author - two" , "Mark -, pen name of S. L. Clemens" .)

I've seen this clue in the King Feature Syndicate.

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